Discrimination of trackball-produced forces

D.V. Keyson

    Research output: Contribution to journalArticleAcademicpeer-review

    1 Citation (Scopus)

    Abstract

    The ability of subjects to discriminate forces counter to user movement generated from a trackball with force feedback was examined as an underlying factor in the interpretation of tactually displayed forms. Subjects were required to report, using an adaptive two-alternative forced-choice method (2AFC), which of two sequentially presented stimuli felt weaker. In the first experiment, three reference force levels of 0.88 N, 0.99 N and 1.10 N by three movement displacements of 20°, 40° and 60° were presented. A second experiment was conducted to examine discrimination from reference forces below 0.88 N and to consider the influence of movement orientation. Results from two experiments indicated that ‘just noticeable differences’ (JNDs) in a range from 0.4 to 1.1 N were relatively constant at a level of 15%. In the lower force range, 0.2-0.4 N, JNDs were observed to increase with decreasing force level. The movement amplitude and orientation, whether horizontal or vertical, appeared to have no effect on the observed JND. The experiments showed that the discrimination of forces correlated with the subject's movement speeds within the upper force range.
    Original languageEnglish
    Pages (from-to)143-152
    Number of pages10
    JournalDisplays
    Volume18
    Issue number3
    DOIs
    Publication statusPublished - 1998

    Fingerprint Dive into the research topics of 'Discrimination of trackball-produced forces'. Together they form a unique fingerprint.

    Cite this